111111122022221 has 4 divisors (see below), whose sum is σ = 111111184461312. Its totient is φ = 111111059583132.

The previous prime is 111111122022163. The next prime is 111111122022247. The reversal of 111111122022221 is 122220221111111.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 111111122022221 - 2⁴⁶ = 40742377844557 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111111122022193 and 111111122022202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111111122072221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28469531 + ... + 32136216.

It is an arithmetic number, because the mean of its divisors is an integer number (27777796115328).

Almost surely, 2^{111111122022221} is an apocalyptic number.

It is an amenable number.

111111122022221 is a deficient number, since it is larger than the sum of its proper divisors (62439091).

111111122022221 is an equidigital number, since it uses as much as digits as its factorization.

111111122022221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62439090.

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 111111122022221 its reverse (122220221111111), we get a palindrome (233331343133332).

The spelling of 111111122022221 in words is "one hundred eleven trillion, one hundred eleven billion, one hundred twenty-two million, twenty-two thousand, two hundred twenty-one".